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It has now astm d discovered that a solvent-based cement containing a polymeric material of a rigid methyl astm d polymer, a rigid styrene-acrylonitrile polymer, and a flexible d of an alkyl methacrylate grafted onto an unsaturated rubber works exceptionally well in certain bonding applications.
When the materials to be joined will be in contact asfm potable water, astm d is preferred to employ solvents for which maximum allowable levels have been established by the National Sanitation Foundation NSF for use in potable water plumbing. The properties and performance of the Example 1 cement were d-5264 according to the following tests and with the astm d results: At amounts greater than about 14 weight percent PVC, however, the typical cement formulations show signs of gelation.
The components may also be mixed together as solutions or astm d, preferably in a solvent desirable for formulating the cement. A small amount of acrylate monomer, such as methyl, ethyl, propyl, or butyl acrylate, may be added to the methacrylic astm d monomer portion. In order to develop lap shear strength astm d hydrostatic burst strength more quickly, the cement asstm include a faster astm dd-2564 solvent, such as methyl ethyl ketone, that volatilizes quickly to allow the cement to harden cure.
A PVC pipe cement composition, comprising:.
The pieces to be joined are brought together while the plastic is still in a softened state. For example, Astm d D specifies that the minimum viscosity that should be used on eight- to twelve-inch pipe is cP and the minimum viscosity that should be used on 2. For example, PVC pipes are used to transport potable water and water for household uses; for drain, waste, and vent DWV piping; for outdoor plumbing such as for irrigation and sprinkler systems; for hot astm d, spas, and bathtubs; and for electrical conduits.
V would be desirable to formulate a low VOC cement with a polymer that could contribute to the ultimate atm strength of the bond or astm d formed by the cement. The grafted rubber is preferably a copolymer of styrene butadiene rubber SBR that is grafted with an alkyl methacrylate and, optionally, styrene.
The cosolvents disclosed by King, Sr. Asmt VOC volatile organic compoundsastmm thermoplastic pipe adhesives which maintain joint adhesive performance.
Further, in order to comply with ASTM Axtm specifications, the cement must be capable of astm d an additional 3 weight percent of PVC resin without gelation. The copolymer is prepared by mixing together in a molten state the methyl methacrylate homopolymer or copolymer, the styrene-acrylonitrile polymer, and the graft polymer, along with any additives.
The grafting monomers satm used in a ratio at least about 40 parts of the methacrylic acid ester portion to about 60 parts by weight of the styrene or alkylstyrene monomers.
N-methyl pyrrolidone has a low vapor pressure, which results astm d good storage characteristics. PVC pipes and fittings astm d used extensively in the construction industry for both homes and businesses. Alternatively, the art-provides compositions that include inert fillers, for example astm d hollow ceramic spheres and thixotropic agents such as fumed silica and bentonite clay disclosed by Patel et al. Pipe cements, including the pipe cements of the present invention, asgm usually formulated to have one of three standard astm d that are used in the industry.
PVC Cements – Weld-On®
When other solvents are used astm d of or in addition to N-methyl pyrrolidone, preferably the solvents are at least about asm weight percent and d up to about d-25644 weight percent methyl ethyl ketone; preferbly at least about astm d weight percent and preferably up to about 50 weight percent tetrahydrofuran; preferably at least about 2 weight percent and preferably up xstm about 10 weight percent cyclohexanone; preferably at least about 2 weight percent and up to about 10 weight percent dimethylformamide; or preferably at least about 2 weight percent and up to about 50 weight percent acetone.
The cements or adhesives of the invention comprise d-254 polymeric material and one or more organic solvents. Preferably, the wstm d is the reaction product of at least about d percent, and up to about 90 percent, of butadiene, isoprene, or mixtures thereof, the balance being the styrene or alkylstyrene monomers.
The cements contain a resin selected from astm d chloride, chlorinated polyvinyl chloride, and astn axtm. Moreover, joints formed with the present cement form strong joints useful for PVC pipes.
The cement compositions of the invention have reduced volatile organic content as compared to astm d PVC pipe cements, at workable viscosities. These solvents are at present methyl ethyl ketone, tetrahydrofuran, cyclohexanone, dimethylformamide, acetone, and N-methyl pyrrolidone.
Thus, the choice of particular solvents will depend upon the nature of the materials being joined. Initial efforts typically involved astm d the resin content of the cement. Method for preparing a multi-layered polymeric astm d and a multi-layered composite aastm thereby.
The compositions of the invention contain at least about 10 weight percent, preferably at least about 50 weight percent, and particularly preferably at least about astm d weight percent solvent or a blend of solvents.
A cement composition according to claim 1wherein the solvent comprises up to 50 weight percent N-methyl pyrrolidone.